docstr: test that creation fails with a negative size 
docstr_tok: ["test","that","creation","fails","with","a","negative","size"]
code: def test_negative_size(self):
      """test that creation fails with a negative size"""
      with self.assertRaises(ValueError):
          aubio.dct(-1)
  
file_path: aubio/python/tests/test_dct.py
imports: import numpy
  from numpy.testing import TestCase, assert_almost_equal
  import aubio
label_desc: Use image node_id 5 for calling the aubio_dct obj's underlying member method code with example usage: obj.test_negative_size() without return types